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// ==============================================================
// This file is part of Glest Shared Library (www.glest.org)
//
// Copyright (C) 2001-2008 Martio Figueroa
//
// You can redistribute this code and/or modify it under
// the terms of the GNU General Public License as published
// by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version
// ==============================================================
#include "opengl.h"
#include <stdexcept>
#include "graphics_interface.h"
#include "context_gl.h"
#include "gl_wrap.h"
#include "leak_dumper.h"
using namespace Shared::Platform;
using namespace std;
namespace Shared{ namespace Graphics{ namespace Gl{
// =====================================================
// class Globals
// =====================================================
bool isGlExtensionSupported(const char *extensionName){
const char *s;
GLint len;
const GLubyte *extensionStr= glGetString(GL_EXTENSIONS);
s= reinterpret_cast<const char *>(extensionStr);
len= strlen(extensionName);
while ((s = strstr (s, extensionName)) != NULL) {
s+= len;
if((*s == ' ') || (*s == '\0')) {
return true;
}
}
return false;
}
bool isGlVersionSupported(int major, int minor, int release){
const char *strVersion= getGlVersion();
//major
const char *majorTok= strVersion;
int majorSupported= atoi(majorTok);
if(majorSupported<major){
return false;
}
else if(majorSupported>major){
return true;
}
//minor
int i=0;
while(strVersion[i]!='.'){
++i;
}
const char *minorTok= &strVersion[i]+1;
int minorSupported= atoi(minorTok);
if(minorSupported<minor){
return false;
}
else if(minorSupported>minor){
return true;
}
//release
++i;
while(strVersion[i]!='.'){
++i;
}
const char *releaseTok= &strVersion[i]+1;
if(atoi(releaseTok)<release){
return false;
}
return true;
}
const char *getGlVersion(){
return reinterpret_cast<const char *>(glGetString(GL_VERSION));
}
const char *getGlRenderer(){
return reinterpret_cast<const char *>(glGetString(GL_RENDERER));
}
const char *getGlVendor(){
return reinterpret_cast<const char *>(glGetString(GL_VENDOR));
}
const char *getGlExtensions(){
return reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS));
}
const char *getGlPlatformExtensions(){
Context *c= GraphicsInterface::getInstance().getCurrentContext();
return getPlatformExtensions(static_cast<ContextGl*>(c)->getPlatformContextGl());
}
int getGlMaxLights(){
int i;
glGetIntegerv(GL_MAX_LIGHTS, &i);
return i;
}
int getGlMaxTextureSize(){
int i;
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &i);
return i;
}
int getGlMaxTextureUnits(){
int i;
glGetIntegerv(GL_MAX_TEXTURE_UNITS, &i);
return i;
}
int getGlModelviewMatrixStackDepth(){
int i;
glGetIntegerv(GL_MAX_MODELVIEW_STACK_DEPTH, &i);
return i;
}
int getGlProjectionMatrixStackDepth(){
int i;
glGetIntegerv(GL_MAX_PROJECTION_STACK_DEPTH, &i);
return i;
}
void checkGlExtension(const char *extensionName){
if(!isGlExtensionSupported(extensionName)){
throw runtime_error("OpenGL extension not supported: " + string(extensionName));
}
}
}}}// end namespace
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